August in Wagga Wagga is the rainiest month of the year. In August, the weather in Wagga Wagga is typically warm. Average daily high temperature in August is about 13 degrees above zero. On average, Wagga Wagga has 12 sunny, 9 rainy, 9 partly cloudy, and 1 cloudy day in August. The rains are usually moderate. August as well as June and July is considered the most uncomfortable time to visit Wagga Wagga.